Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating cooling fan, keep your hands and clothing away from the cooling fans when working in the engine compartment with the engine running or the power switch on (IG).

PROCEDURE

1. PERFORM SPARK TEST

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Check for DTCs.

NOTICE:

If any DTCs are present, perform troubleshooting in accordance with the procedure for each DTC.

(f) Turn the power switch off.

(g) Remove the 4 ignition coil assemblies and 4 spark plugs.

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(h) Remove the front wheel opening extension pad LH.

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(i) Remove the front wheel opening extension pad RH.

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(j) Remove the No. 1 engine under cover.

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(k) Remove the No. 2 engine under cover assembly.

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(l) Disengage the claw and raise the lock lever to disconnect the No. 6 engine wire connector as shown in the illustration. NOTICE: Perform this step in order to stop fuel injection and prevent damage to the catalyst due to unburned fuel.

*a Lock Lever

(m) Disconnect the No. 5 engine wire connector. NOTICE: Perform this step in order to stop fuel injection and prevent damage to the catalyst due to unburned fuel.

(n) Install the spark plug to the ignition coil assembly, and then connect the ignition coil assembly connector.

(o) Turn the power switch on (IG).

(p) Turn the Techstream on.

(q) Put the engine in Inspection Mode (Maintenance Mode).

(r) Ground the spark plug.

(s) Check that spark occurs at each spark plug while the engine is being cranked.

NOTICE:

• Be sure to ground the spark plugs when checking them.
• Do not crank the engine for more than 2 seconds.
• If an ignition coil assembly or spark plug has been struck or dropped, replace it.

HINT:

• If spark does not occur, perform the following procedure.
• If spark does not occur for any cylinder, inspect the ignition circuit.

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(t) Connect the No. 5 engine wire connector.

(u) Connect the No. 6 engine wire connector and push down the lock lever to engage the claw as shown in the illustration.

*a Lock Lever

(v) Install the No. 2 engine under cover assembly.

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(w) Install the No. 1 engine under cover.

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(x) Install the front wheel opening extension pad LH.

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(y) Install the front wheel opening extension pad RH.

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(z) Install the 4 ignition coil assemblies and 4 spark plugs.

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(aa) Turn the power switch on (IG).

(ab) Turn the Techstream on.

(ac) Enter the following menus: Powertrain / Engine / Trouble Codes.

(ad) Check for DTCs.

(ae) Clear the DTCs.

2. INSPECT IGNITION COIL ASSEMBLY AND SPARK TEST

HINT:

Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug.

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(a) Check that the ignition coil assembly connector is securely connected.

(b) Perform a spark test on each ignition coil assembly.

(1) Replace the ignition coil assembly with a known good one.

(2) Perform the spark test again.

NOTICE:

If an ignition coil assembly or spark plug has been struck or dropped, replace it.

(c) Perform a spark test on each spark plug.

(1) Replace the spark plug with a known good one.

(2) Perform the spark test again.

NOTICE:

If an ignition coil assembly or spark plug has been struck or dropped, replace it.

(d) Connect the No. 5 engine wire connector.

(e) Connect the No. 6 engine wire connector and push down the lock lever to engage the claw as shown in the illustration.

*a Lock Lever

(f) Install the No. 2 engine under cover assembly.

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(g) Install the No. 1 engine under cover.

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(h) Install the front wheel opening extension pad LH.

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(i) Install the front wheel opening extension pad RH.

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(j) Install the 4 ignition coil assemblies and 4 spark plugs.

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(k) Turn the power switch on (IG).

(l) Turn the Techstream on.

(m) Enter the following menus: Powertrain / Engine / Trouble Codes.

(n) Check for DTCs.

(o) Clear the DTCs.

3. CHECK SPARK PLUG

NOTICE:

• Do not damage the iridium tip and platinum tip.
• Check the iridium tip visually since the iridium tip may be damaged.
• Never attempt to adjust the electrode gap of a used spark plug.
• Replace with new spark plugs if extremely dirty due to sludge, etc.
• Replace with new spark plugs if damaged at all.
• Replace with a new spark plug if it has been struck or dropped.
• When replacing with a new spark plug, do not remove the cap for protecting the spark plug tip until it is installed to the engine.

HINT:

Perform "Inspection After Repair" after replacing a spark plug.

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(a) Check the electrode. (1) Using a megohmmeter, measure the insulation resistance. Standard Insulation Resistance: Tester Connection Condition Specified Condition Spark plug (terminal part) - Body ground Always 10 MΩ or higher HINT: If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again. If a megohmmeter is not available, perform the following simple inspection instead.

*a Body Ground

(b) Alternative inspection method.

(1) Connect the Techstream to the DLC3.

(2) Turn the power switch on (IG).

(3) Turn the Techstream on.

(4) Put the engine in Inspection Mode (Maintenance Mode).

(5) Start the engine.

NOTICE:

Do not perform this step when any of the following DTCs are output: P030000, P030027, P030085, P030100, P030200, P030300, P030400 (Cylinder Misfire Detected).

(6) Quickly accelerate the engine to 2500 rpm 5 times.

NOTICE:

Do not perform this step when any of the following DTCs are output: P030000, P030027, P030085, P030100, P030200, P030300, P030400 (Cylinder Misfire Detected).

(7) Remove the spark plug.

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(8) Visually check the spark plug.

HINT:

If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

(c) Check the spark plug for any damage to its threads and insulator.

If there is any damage, replace the spark plug.

Recommended Spark Plug:

(d) Check the spark plug electrode gap. Maximum Electrode Gap for Used Spark Plug: 1.2 mm (0.0472 in.) NOTICE: Never attempt to adjust the electrode gap of a used spark plug. If the spark plug electrode gap is more than the maximum, replace the spark plug. Standard Electrode Gap for New Spark Plug: 0.7 to 0.8 mm (0.0276 to 0.0315 in.)

*a Spark Plug Electrode Gap

(e) Install the spark plug.

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4. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug.

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